Medicare Coverage for Addiction and Substance Use Treatment

Medicare covers more addiction treatment than many people realize, and less than some assume. If you are 65 or older, or you qualify for Medicare through disability, the program pays for hospital-based detox, outpatient therapy, intensive outpatient programs, and medications for opioid use disorder. It generally does not pay for a standalone residential rehab facility, and one rule about parity means Medicare is treated differently from private insurance. Knowing the shape of the benefit helps you ask the right questions instead of being surprised.

The four parts, briefly

Medicare has four parts, and each plays a role in behavioral health:

• Part A (hospital insurance) covers inpatient hospital stays, including hospital-based detoxification and inpatient psychiatric care.
• Part B (medical insurance) covers doctors' services, outpatient care, and preventive services, including most outpatient mental health and substance use disorder treatment.
• Part C (Medicare Advantage) is an alternative way to get Part A and Part B through a private, Medicare-approved plan, and most plans include Part D.
• Part D is Medicare drug coverage, which may cover medications such as buprenorphine and naltrexone.

Inpatient care and the 190-day limit

Part A covers mental health care when you are admitted as a hospital inpatient, and Part B covers the services you get from doctors while you are in the hospital. You can receive these services in a general hospital or in a psychiatric hospital.

The single most important limit to know: if you are in a freestanding psychiatric hospital, Part A pays for up to 190 days of inpatient psychiatric hospital services during your lifetime. That cap does not apply to psychiatric care you get in a general hospital or its distinct psychiatric unit, which is why the setting matters so much. In practical terms, a person who has exhausted the 190 days can still receive covered inpatient psychiatric care in a general hospital.

In 2026, your cost for each benefit period is:

• Days 1 through 60: $1,736 deductible, then $0 per day
• Days 61 through 90: $434 per day
• Days 91 through 150: $868 per day, using your 60 lifetime reserve days
• After day 150: you pay all costs

You also pay 20% of the Medicare-approved amount for mental health services from providers while you are an inpatient. There is no limit to the number of benefit periods, so the deductible applies again each time a new benefit period begins.

Outpatient, IOP, and partial hospitalization

Part B covers a wide range of outpatient behavioral health services, including individual and group psychotherapy, family counseling when it supports your treatment, psychiatric evaluation, medication management, testing, partial hospitalization, and intensive outpatient program services. It also covers mental health services you get as part of substance use disorder treatment, and medications used for substance use disorder.

After you meet the annual Part B deductible, you generally pay 20% of the Medicare-approved amount for these visits. Some settings, like a hospital outpatient department, may add a copayment. One yearly depression screening is covered at no cost if the provider accepts assignment.

Medicare's outpatient benefit is also where intensive outpatient programs live. You can get IOP services at a hospital, community mental health center, Federally Qualified Health Center, Rural Health Clinic, or Opioid Treatment Program.

Medications for opioid use disorder and the OTP benefit

Medicare covers medications for opioid use disorder, including methadone, buprenorphine, and naltrexone, plus overdose-reversal medications such as naloxone and nalmefene. Where you get them changes which part pays:

• Part A covers these medications when you receive them as an inpatient at a hospital.
• Part B covers them when you get them in a doctor's office or through an Opioid Treatment Program.
• Part D may cover buprenorphine and naltrexone and overdose-reversal drugs, depending on the plan.

The Opioid Treatment Program (OTP) benefit is worth understanding. OTPs must be certified by SAMHSA and accredited by an approved body, and Medicare pays them through bundled payments for Part B patients. Under the benefit, Medicare covers FDA-approved medications, dispensing and administration, substance use counseling, individual and group therapy, toxicology testing, intake activities, periodic assessments, intensive outpatient program services, coordinated care and referrals, patient navigational services, and peer recovery support services. If you use an OTP enrolled in Medicare that meets the requirements, you will not have copayments, and the Part B deductible applies. You can receive treatment for as long as it is reasonable and necessary.

Medicare Advantage and what Medicare does not cover

Medicare Advantage (Part C) plans must cover all medically necessary services that Original Medicare covers, and most include Part D. Plans may require prior authorization and may use a network, and most offer some extra benefits. If you are in a Medicare Advantage plan, check the plan's rules for the level of care you are considering.

Two honest limits. First, Original Medicare generally does not cover long-term residential (non-hospital) treatment facilities, so a standalone residential program is often not a standard Part A benefit. Second, federal parity laws, including the Mental Health Parity and Addiction Equity Act, do not apply to Medicare, although some parity rules do apply to Medicaid managed care. That does not mean Medicare has no behavioral health coverage; it means the protections come from Medicare's own rules rather than from the parity law.

Getting a real answer for your situation

Call 1-800-MEDICARE or your Medicare Advantage plan and ask specifically about the level of care you are considering, whether prior authorization is required, and what your cost share would be. If you want help sorting through the options first, call (800) 653-9376. The call is free to you, the referral service is paid for by treatment providers, and there is no judgment on the line. SAMHSA's National Helpline (1-800-662-4357) is another free, confidential option available 24 hours a day.

If you are in crisis right now, call or text 988 for the Suicide and Crisis Lifeline. Call 911 for a medical emergency.

Questions about Medicare Coverage